Hadronic mass scales and phase transitions in QCD

The connection is discussed between the phase transitions in the hot hadronic matter and characteristic mass parameters of the nonperturbative QCD. The spectrum of the hot hadronic matter containing light coloured scalar fields in addition to ordinary quarks and gluons is investigated by means of the finite-temperature QCD sum rules. A qualitative rearrangement of the spectrum is shown to occur at some temperature Tsub(cr), which is entirely fixed by the value of the scalar field condensate . A varity of possible phase transitions in such a matter is considered